Electrical hoisting apparatus.



PATENTED OCT. 4, 1904. E. B. CLARK, 2D. A ELECTRICAL HOISTING APPARATUS.

' APPLICATION FILED JAN. 23. 1902.

N0 MODEL.

17 SHEETS-SHEET 1.

PATENTED OCT. 4, 1904.

E. B. CLARK, 2D. ELECTRICAL HOISTING APPARATUS.

APPLICATION FILED JAN. 23. 1902.

N0 MODEL. 17 SHEETSSHEET 2.

PATENTED OCT. 4, 1904. E. B. CLARK, 2D.

ELEGTRIGAL HOISTING APPARATUS.

APPLIUATION FILED JAN. 23. 1902. N0 MODEL. 17 SHEETS-SHEETS vH W 'L' 5 A i m EH "l' flflew z w am No. 771,351. PATENTED OCT. 4, 1904. E. B. CLARK, 2D.

ELECTRICAL HOISTING APPARATUS.

APPLIUATION FILED JAN. 23. 1902. N0 MODEL.

17 SHEETS-SHEET 4.

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ELECTRICAL HOISTING APPARATUS.

I APPLICATION FILED JAN. 23. 1902. N0 MODEL. 17 SHEETS-SHEET 5.

PATENTED 001'. 4, 1904. E. B. CLARK, 2D. ELEGTRIGAL HOISTING APPARATUS.

APPLICATION FILED JAN. 23. 1902.

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N0 MODEL.

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- E. B. CLARK, 2D.

ELECTRICAL HOISTING APPARATUS.

APPLIGATION FILED JAN. 23. 1902 A 17 SHEETSSHEET 7.

N0 MODEL.

PATENTED OCT. 4, 1904 E. B. CLARK, 2D.

ELECTRICAL HOISTING APPARATUS.

APPLICATION FILED JAN. 23. 1902.

17 SHEETS-SHEET B N0 MODEL.

No. 771,351. PATENTED OCT. 4, 1904. E. B. CLARK, 2D.

ELECTRICAL HOISTING APPARATUS.

' APPLICATION FILED JAN. 23, 1902. N0 MODEL, 17 SHEETS-SHEET 9.

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ELECTRICAL HOISTING APPARATUS.

APPLICATION FILED JAN. 23, 1902.

17 SHEETS-SHEET 10.

N0 MODEL.

N0. 771w. PA'I'ENTED 0014,1904. E. B. CLARK, 2D.

ELECTRICAL HOISTING APPARATUS.

APPLICATION FILED JAN. 23. 1902. NO MODEL.

17 SHEETS-SHEBT 11.

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APPLICATION PILEDJA1L23. 1902. N0 MODEL. 17 SHBETSSHEET l2.

No. 771,351. PATENTED OCT. 4, 1904..

E. B. GLARK, 2D.

ELECTRICAL HOISTING APPARATUS.

APPLIGATION FILED JAN. 23. 1902.

17 SHEETS-SHEET 13.

N0 MODEL.

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B.B.GLARK,2D. ELECTRICAL HOISTING APPARATUS.

17 SHEETS-SHEET 16.

NO MODEL.

APPLIGATION FILED JAN. 23. 1902.

il kl ll No. 771,351. PATENTED OCT. 4, 1904.

E. B. CLARK, 2D. ELECTRICAL HOISTING APPARATUS.

APPLICATION FILED JAN. 23, 1902.

. 17 SHEETS-8HEET 17.

N0 MODEL.

UNITED STATES Patented October 4, 1904:.

PATENT OFFICE.

EUGENE B. CLARK, 21), OF CHICAGO, ILLINOIS, ASSIGNOR TO OTIS ELEVATOR COMPANY, AGORPORATION OF NE'W JERSEY.

ELECTRICAL HOISTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. '77 1,351, dated October 4, 1904.

Application filed January 23, I902. Serial No. 90,870. (No model.)

To aZZ whom it may concern.-

Be it known that I, EUGENE B. CLARK, 2d, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electrical Hoisting Apparatus, of which the following is a specification, reference beinghad to the accompanying drawings.

My invention relates to hoisting mechanism, and has special reference to hoists or elevators arranged to be operated and controlled by electric mechanism.

The special embodiment of my invention illustrated in the accompanying drawings and hereinafter described is an electric skip-hoist or hoisting apparatus designed for use in supplying ore, coke, coal or charcoal, and limestone to blast-furnaces; but my invention is not restricted to use for such purpose only, and I wish it to be understood that my improvements, in so far as they are applicable, may be employed in various forms of hoisting machinery. WVith this understanding I shall direct my explanation of the apparatus and its operation particularly to the mechanism illustrated in the drawings.

The class of labor employed in iron and steel mills for charging the blast-furnaces is comparatively low as regards intelligence, so that it is highly desirable, if not imperative, that the machinery employed be of such construction that it may be operated by persons of even the least intelligence and experience, and this has prevented to a large extent the employment of electrichoisting machinery where it has been necessary for it to be operated by unskilled laborers, as considerable judgment down, and stoppage, and the adjustment of the mechanism for reverse movementbeing automatically effected.

Another object is to provide means by which the electric mechanism may be controlled and regulated by hand if it should be necessary so to do on account of injury to the automatic mechanism.

Other objects, which relate to more specific improvements, are to provide for the positive regulation of the speed independently of the load, to provide a plurality of motors either of which is capable of operating the skip or car and either of which may be cut out in case of accident to the motor or gearing, to provide for the operation of the skips from a distant point or a number of distant points by simply closinga switch, to provide a plurality of independent brakes automatically operated either one capable of stopping and holding a full load, and to secure economy of operation by employing speed-controlling mechanism by which the maximum. efiiciency at all speeds is insured. 1 accomplish these objects as illustrated in the drawings and as hereinafter described.

That which I regard as new will be set forth in the claims.

My improved hoisting apparatus consists, generally speaking, of a pair of hoistingdrums, to which skips are connected by oppositely arranged cables, said drums being mounted to rotate in unison and being driven by a pair of electric motors to hoist one skip loaded while another descends empty for another load. Said motors are provided with solenoid-brakes, either of which is ample to sustain the weight of the full load. The drumshaft is geared to and operates the controlling mechanism by which the operation of the motors is controlled. Said controlling mechanism provides for operating an ordinary seriesparallel controller, by which the speed of the motors is regulated; also, for reversing the motors, for slowing them down, and for stopping them. Suitable switches, both automatic and manual, also form a part of the apparatus and provide for making and breaking the circuits necessary to securing the proper operation of the apparatus, as will be fully hereinafter described.

In tle accompanying drawings, Figure 1 is a front elevation of the mechanical devices including the drums, motors, and controlling mechanism. .Fig. 2 is a vertical section on Figs. 3, 4, and 5 are enline 2 2 of Fig. 1. larged front elevations, respectively, of the motors, drums, and controlling mechanism. Fig. 6 is a plan view of the motors, brakes, and adjacent parts of the mechanism. Fig. 7 is'a rear elevation of the controlling mechanism. Fig. 8 is a plan view thereof. Fig. 9 is a section on line 9 9 of Fig. 7. Fig. 10 is an enlarged detail, being a front elevation of the stopping mechanism, some parts being in section. Fig. 11 is an end view of the same. Fig. 12 is an enlarged detail, partly in section, being a front elevation of the slow-down switch. Fig. 13 is an end view of the housing which carries the devices for regulating the operation of the controller. Fig. 14 is a diagrammatic plan view of the automatic controller. Figs. 15 and 16 are diagrammatic views illustrating the blocks by which the operation of the controller is regulated in different positions of adjustment. Fig. 17 is a partial sectional view illustrating the interior of one of the housings in which the regulatingblocks are carried, showing said blocks in position. Fig. 18 is a sectional view of one of the housings. Figs. 19, 20, 21, 22, 23, and 24 are plan views of the different regulatingblocks. Fig. 25 is a section of one of the blocks, showing the outline of the groove through it. Fig. 26 is a diagrammatic view illustrating the system of wiring, and Figs. 27, 28, 29, and 30 are diagrammatic views illustrating the different circuits established during the operation of the machine.

Referring to the drawings, indicates the bed-plate of the machine, which is preferably made in sections and is of suitable shape and construction to support the parts of the machine.

36 37 indicate the drums, which are carried on a common shaft 38 and are connected by a cylinder 39, as shown in Fig. 1. Said drums are provided with spiral grooves oppositely arranged to receive the cables of oppositelymoving skips or cars, the arrangement being such that one skip moves up loaded while the other descends empty. The shaft 38 is journaled in standards 40 41, one end projecting beyond the standard 41 and carrying a gear 42, as best shown in Figs. 1 and 5.

43 indicates a large gear carried adjacent to the drum 37 and keyed thereto, said gear being arranged to mesh with a pinion 44, mounted on a shaft 45, which is mounted in suitable bearings on the bed-plate 35, near the inner ends thereof, and extends parallel with the shaft 38. The shaft 45 carries at its outer end a gear 46, which .meshes with pinions 47 48, mounted on the shafts 49 50 of motors 51 52, respectively. Said motors are arranged parallel with each other on the bed-plate 35 and are arranged to operate in unison to drive the gear 46 and shaft 45 and through said shaft and gear to operate the drums 36 37 and also the controlling mechanism.

53 54 indicate solenoid-brakes connected to the shafts of the motors 51 52, respectively. Each of said brakes is provided with two coils, one for hand and the other for automatic operation, as hereinafter set forth, and each brake must be powerful enough to sustain the weight of a full load. In the construction illustrated the brakes are of the usual strapand-wheel type, the construction of which is so well known that detailed description thereof is not deemed necessary. It will be sufficient to say that the brake-straps 55 56 are normally held in frictional engagement with their respective wheels 57 58 by brake-springs 59 60, the brakes being released by the passage of the electric current through either of the two coils of the solenoids, which are contained in the housings 61 62, respectively. It will thus be seen that when the solenoid-coils are out of circuit the brakes are set, while when the selenoid coils are in circuit the brakes are released.

63 indicates a controller of the type known as series parallel, commonly employed to control two motors by varying connections from series to parallel. troller-shaft, the rotation of which regulates the speed of the motors. By partly rotating said shaft to the different positions shown in Fig. 14 the current may be varied from the minimum to the maximum or may be cut off altogether. The controller is provided with suitable reversing mechanism, as hereinafter described. The construction of the controller in other respects is immaterial to my present invention, as it may be of any approved type suitable for the purpose. At its upper end the shaft 64 carries a beveled pinion 65, as shown in Fig. 5. As illustrated in Fig. 8, the controller 63 is placed on the bed-plate 35 at the end opposite that which carries the motors, and it is arranged to be operated from the shaft 38 through the instrumentality of mechanism which will now be described.

66 indicates a shaft arranged in a horizontal position on a suitable frame 67 carried on standards 68 69. The shaft 66 is supported slightly above the horizontal plane of the beveled pinion and extends from near the gear 42 to the beveled pinion 65, where it is provided with a beveled pinion 70, which meshes with the pinion 65, as best shown in Figs 5 and 8. The shaft 66 is rotatably mounted in The pinion 73 does not,

64 indicates the conhowever, rotate independently of the shaft 66, since it is mounted on a feather thereon, or the shaft is made square in cross-section. Consequently rotation of the pinion 73 rotates the shaft 66. The pinion 73 is provided at opposite sides with disks 7 1 75 of slightly greater diameter than the pinion, so that said disks project beyond the edges of the pinion for the purpose to be hereinafter stated.

76 indicates a screw-threaded shaft or spindle, which is mounted in suitable bearings 77 78 and extends parallel with the shaft 66 and adjacent thereto, as shown in Fig. 8. One end of the shaft 76 projects inward through the bearing 77 and carries a pinion 79, which meshes with the gear 42, as shown in Fig. 8. The rotation of the gear 12 therefore rotates the shaft 76.

.80 indicates a traveling nut in the form of a segmental rack which is mounted on the shaft 76 and is moved longitudinally upon the screw-threads of said shaft when it is rotated.

The nut or segment 80 carries a depending,

arm 81, upon the lower end of which is mounted an antifriction-roller 82, which moves in a groove 83, extending longitudinally of the frame 67, as best shown in Figs. 8 and 9. The groove 83 extends from near one end of the shaft 76 to near the other end thereof and serves to prevent the segment 80 from rotating upon the shaft 76. As shown in Fig. 9, the teeth of the rack 80 mesh with the teeth of the pinion 73, extending between the disks 74. 75. The result is that as the segment 80 moves longitudinally of the shaft 76 it carries with it the pinion 73, said pinion being thereby moved longitudinally of its shaft 76, and as said segment and pinion are constantly in mesh the pinion 73 cannot rotate independently of the segment 80. Consequently the rotation of the shaft 66, by which the controllershaft 64 is rotated, is dependent entirely upon the rocking of the segment 80. For the pur pose of rocking said segment guide-grooves 84 are provided near the ends of the shaft 76, said grooves being formed by aseries of guideblocks85 86 87 88 89 90, as best shown in Figs. 15 and 16. It will be understood that a greater or less number of blocks may be employed, depending on the number of steps it is desired to have in the guide-groove. The guide-blocks forming the guide grooves are mounted in housings 91 92,arranged at the opposite ends of the shaft 76, as shown in Fig. 8, said housings being of suitable shape to hold the guideblocks in proper position. Owing to the fact that the arm 81 swings about the shaft 76 as an axis when the segment 80 is rocked, it is necessary that the inner surfaces of the guideblocks be substantially equidistant from the shaft 76, making the inner surfaces of the blocks substantially concentric with the shaft 76, and the housings 91 92 are consequently segmental in form, as shown in Fig. 18. To hold the different guide-blocks in position and provide for their adjustment to regulate the outlines of the grooves 82, and thereby adjust the operation of the nut or segment 80, each block is provided with a stem 93,

each of said stems extending through a plate 94 at one side of the housing and carrying nuts 95 96, by which it may adjusted and locked in place. In addition to the stems 93 setscrews 97 are provided,which pass through the curved surface of the housing and screw into the blocks at an angle to the stems 93, as best shown in Figs. 7 and 17. Holes 98 are provided in the housing for that purpose. By this construction the position of the guideblocks may be regulated within rather wide limits. For example, as illustrated in Fig. 15, the blocks may be moved to form practically a continuous groove, or, as illustrated in Fig. 16, a series of steps may be provided in said groove, and such steps may be uniform or irregular, depending on the nature of the adjustment which it is desired to effect in the controller. The groove in the lowermost guide-block registers with the adjacent end of the groove 83, so that the antifrictionroller 82 of the segment 80 passes from the groove 83 into the lower end of the groove 84, and as the nut or segment 80 is screwed along on the shaft 76 its arm 81 is deflected by the groove 84, which moves it outward. as illustrated in Fig. 8, consequently rocking the segment 80 in the direction indicated by the arrow in Fig. 9, thereby rotating the shaft 66 in the opposite direction and moving the controller-shaft 64: in the direction indicated by the arrow in Fig. 8. The controller is so arranged that such movement of the shaft 64: reduces the speed, the two motors being in series, with all the resistance in circuit by the time the arm 81 reaches the uppermost guideblock 85. The hoist is therefore slowed down gradually and finally stopped, as more fully hereinafter described. This operation takes place when the segment 80 approaches either end of the shaft76. WVhen the arm 81 moves down in either groove 8 1,the speed is increased until said arm reaches the groove 83, when the speed is at the maximum, continuing so.

until the housing at the opposite end of the shaft 76 is reached, when the speed is again reduced and the hoist finally stopped, as above described.

The stopping-switch (indicated on the diagrammatic views by the letter G) by which the connections are autol'natically established that make it possible to start the motors in an opposite direction is also carried by the frame 67 and is best shown in Figs. 5, 8, 9, 10, and 11. Its construction is as follows:

99 indicates a rocking lever which is mounted on a horizontal pivot 100, secured in a plate 101, carried between standards 102 103, which, as shown in Figs. 5 and 10, are carried by the frame 67. The lever 99, as shown in Fig. 10, is in the shape of a cross, its long arm 1'04 

